Miralax Risks? Advice Needed

I’ve been dealing with serious constipation lately that has gotten worse. I’m seeing a GI doctor about it next week. As of now, it’s been about 5 days since i’ve had a bowel movement. I’ve read some pretty harsh things about Miralax, specifically in kids and how it can cause behavioral/mood changes. I speak to one guy also who said he’s crashed hard from using it. Anyone had experience with Miralax?

I use it pretty often, haven’t noticed any issues.

Do not take any laxative, if necesary go to the ER until they agree to give you a hospital enema.
You can also pay a clinic of colon cleans to help with cleaning the colon giving you more time to figure out how to fix constipation a bit